Laser marking technology is one of the biggest applications of laser processing. Laser marking is a marking method that makes use of the high energy density laser to irradiate the work piece locally, so as to make the surface material vaporize or change the color, leave a permanent mark.Laser marking can mark a variety of words, symbols and patterns, the size of the characters can range from millimeters to microns, which has special significance for the product anti-forgery tag.